What octane gas are you using??
08-26-2012 | 09:26 PM
#13
JK Enthusiast
Joined: Feb 2012
Posts: 483
Likes: 0
From: West Haverstraw, New York
Running anything but what is recommended then you are wasting money and hurting your performance.
Higher octane fuel burns slower which causes reduced power.
Engines sometimes require higher octane because they are higher performance (high compression, or forced induction) Those engines need fuel that burns slower (higher the octane the slower the burn) so they do not detonate. If those engines were able to use lower octane they would actually have more power but they would detonate so it is a balance.
Most fuels have the same detergents in them so running a higher grade fuel won't "clean your engine out"
Higher octane fuel burns slower which causes reduced power.
Engines sometimes require higher octane because they are higher performance (high compression, or forced induction) Those engines need fuel that burns slower (higher the octane the slower the burn) so they do not detonate. If those engines were able to use lower octane they would actually have more power but they would detonate so it is a balance.
Most fuels have the same detergents in them so running a higher grade fuel won't "clean your engine out"
Higher Octane fuels, (ie. 91,94,97,101,104,107...) do as You said and burn more slowly,
But with this slower burn Your combustion chamber gets a more complete burn. Thus,
a more complete burn equals More Horse Power.
Racing fuels start at 104 octane and go upwards of 115 octane.
Race cars produce hundreds to thousands of Hp while being naturally aspirated.
NASCAR vehicles have between 750 to 850 Hp using Sunoco 110.
These examples are to prove that the higher octane that you get at the pump
will actually force your engine to perform better than on lower, (81,83,85...) octane.
The text in red is slightly askew as well. High performance engines will detonate on Lower
octane fuels. They demand to be fed the "Good Stuff".
In a Normal civilian vehicle, low octane will not hurt the engine, but don't be looking for
a great mpg either. If You want to stretch your mpg's, go with the higher octane.
If you want power and performance, go with the higher octane.
If your concerned with how much money Gas costs, go with the lower octane.
Also, E-85, or "Corn" gas, or ethanol gas of greater than 10% is a Lower Octane Gas.
to prove it; take a drop and put it on a piece of glass. next to a drop of 94 octane gas.
see which evaporates first. the quicker the evaporation, the lower the octane value.
This is the actual test to determine a fuels octane value.
Hope this clears up some misconceptions about Octane Values for Fuel.
And I apologize if I stepped on any toes.
Last edited by BoneShkr; 08-26-2012 at 09:32 PM. Reason: Typo corrections
08-26-2012 | 09:34 PM
#14
JK Jedi Master
Joined: Feb 2008
Posts: 12,882
Likes: 172
From: Maine
Sorry to burst your bubble. About the boldly highlighted statements
Higher Octane fuels, (ie. 91,94,97,101,104,107...) do as You said and burn more slowly,
But with this slower burn Your combustion chamber gets a more complete burn. Thus,
a more complete burn equals More Horse Power.
Racing fuels start at 104 octane and go upwards of 115 octane.
Race cars produce hundreds to thousands of Hp while being naturally aspirated.
NASCAR vehicles have between 750 to 850 Hp using Sunoco 110.
These examples are to prove that the higher octane that you get at the pump
will actually force your engine to perform better than on lower, (81,83,85...) octane.
The text in red is slightly askew as well. High performance engines will detonate on Lower
octane fuels. They demand to be fed the "Good Stuff".
In a Normal civilian vehicle, low octane will not hurt the engine, but don't be looking for
a great mpg either. If You want to stretch your mpg's, go with the higher octane.
If you want power and performance, go with the higher octane.
If your concerned with how much money Gas costs, go with the lower octane.
Also, E-85, or "Corn" gas, or ethanol gas of greater than 10% is a Lower Octane Gas.
to prove it; take a drop and put it on a piece of glass. next to a drop of 94 octane gas.
see which evaporates first. the quicker the evaporation, the lower the octane value.
This is the actual test to determine a fuels octane value.
Hope this clears up some misconceptions about Octane Values for Fuel.
And I apologize if I stepped on any toes.
Higher Octane fuels, (ie. 91,94,97,101,104,107...) do as You said and burn more slowly,
But with this slower burn Your combustion chamber gets a more complete burn. Thus,
a more complete burn equals More Horse Power.
Racing fuels start at 104 octane and go upwards of 115 octane.
Race cars produce hundreds to thousands of Hp while being naturally aspirated.
NASCAR vehicles have between 750 to 850 Hp using Sunoco 110.
These examples are to prove that the higher octane that you get at the pump
will actually force your engine to perform better than on lower, (81,83,85...) octane.
The text in red is slightly askew as well. High performance engines will detonate on Lower
octane fuels. They demand to be fed the "Good Stuff".
In a Normal civilian vehicle, low octane will not hurt the engine, but don't be looking for
a great mpg either. If You want to stretch your mpg's, go with the higher octane.
If you want power and performance, go with the higher octane.
If your concerned with how much money Gas costs, go with the lower octane.
Also, E-85, or "Corn" gas, or ethanol gas of greater than 10% is a Lower Octane Gas.
to prove it; take a drop and put it on a piece of glass. next to a drop of 94 octane gas.
see which evaporates first. the quicker the evaporation, the lower the octane value.
This is the actual test to determine a fuels octane value.
Hope this clears up some misconceptions about Octane Values for Fuel.
And I apologize if I stepped on any toes.
Also, it's been my experience that higher octane in my JK, which runs fine on low octane, doesn't give any better mpg or performance.
I don't think there are any official methods of determining an octane level for gasoline that involve a comparison of rates of evaporation.
Last edited by ronjenx; 08-26-2012 at 09:54 PM.
08-26-2012 | 10:00 PM
#16
JK Enthusiast
Joined: Feb 2012
Posts: 483
Likes: 0
From: West Haverstraw, New York
My only concern was to correct the understanding of the octane values.
How each engine performs with these octane values depends on what
other modifications are made to better utilize a better burning fuel.
ie. a chip in the 'puter, compression ratios, displacement, combustion
chamber size, intensity and duration of the spark, atomized fuel...etc.
This I know for certain;
I own a bone stock 2012 JKU.
On 82 octane I get 15-19.5 mpg on the hwy.
On 101 octane I get 19-24 mpg on the hwy.
I work close to the hwy so doing test runs is easy.
and the 101 octane fuel is Cam II, which is sold near my job.
(mindfully, the 101 octane may be slightly lower as it has "mixed"
with any residual 82 octane in my empty fuel tank.)
How each engine performs with these octane values depends on what
other modifications are made to better utilize a better burning fuel.
ie. a chip in the 'puter, compression ratios, displacement, combustion
chamber size, intensity and duration of the spark, atomized fuel...etc.
This I know for certain;
I own a bone stock 2012 JKU.
On 82 octane I get 15-19.5 mpg on the hwy.
On 101 octane I get 19-24 mpg on the hwy.
I work close to the hwy so doing test runs is easy.
and the 101 octane fuel is Cam II, which is sold near my job.
(mindfully, the 101 octane may be slightly lower as it has "mixed"
with any residual 82 octane in my empty fuel tank.)
Last edited by BoneShkr; 08-26-2012 at 10:05 PM.
08-26-2012 | 10:10 PM
#17
JK Jedi Master
Joined: Feb 2008
Posts: 12,882
Likes: 172
From: Maine
My only concern was to correct the understanding of the octane values.
How each engine performs with these octane values depends on what
other modifications are made to better utilize a better burning fuel.
ie. a chip in the 'puter, compression ratios, displacement, combustion
chamber size, intensity and duration of the spark, atomized fuel...etc.
This I know for certain;
I own a bone stock 2012 JKU.
On 82 octane I get 15-19.5 mpg on the hwy.
On 101 octane I get 19-24 mpg on the hwy.
I work close to the hwy so doing test runs is easy.
and the 101 octane fuel is Cam II, which is sold near my job.
(mindfully, the 101 octane may be slightly lower as it has "mixed"
with any residual 82 octane in my empty fuel tank.)
How each engine performs with these octane values depends on what
other modifications are made to better utilize a better burning fuel.
ie. a chip in the 'puter, compression ratios, displacement, combustion
chamber size, intensity and duration of the spark, atomized fuel...etc.
This I know for certain;
I own a bone stock 2012 JKU.
On 82 octane I get 15-19.5 mpg on the hwy.
On 101 octane I get 19-24 mpg on the hwy.
I work close to the hwy so doing test runs is easy.
and the 101 octane fuel is Cam II, which is sold near my job.
(mindfully, the 101 octane may be slightly lower as it has "mixed"
with any residual 82 octane in my empty fuel tank.)
I can get 23 mpg on 87 octane.
I've never seen 82 and 101 available at automotive pumps. Is there a different octane rating system in your area?
I can understand the lower octane being available at the higher altitudes, though.
Last edited by ronjenx; 08-26-2012 at 10:33 PM.
08-26-2012 | 11:42 PM
#20
JK Freak
Joined: Nov 2011
Posts: 638
Likes: 0
From: Naperville, Il
Originally Posted by BoneShkr
Sorry to burst your bubble. About the boldly highlighted statements
Higher Octane fuels, (ie. 91,94,97,101,104,107...) do as You said and burn more slowly,
But with this slower burn Your combustion chamber gets a more complete burn. Thus,
a more complete burn equals More Horse Power.
Racing fuels start at 104 octane and go upwards of 115 octane.
Race cars produce hundreds to thousands of Hp while being naturally aspirated.
NASCAR vehicles have between 750 to 850 Hp using Sunoco 110.
These examples are to prove that the higher octane that you get at the pump
will actually force your engine to perform better than on lower, (81,83,85...) octane.
The text in red is slightly askew as well. High performance engines will detonate on Lower
octane fuels. They demand to be fed the "Good Stuff".
In a Normal civilian vehicle, low octane will not hurt the engine, but don't be looking for
a great mpg either. If You want to stretch your mpg's, go with the higher octane.
If you want power and performance, go with the higher octane.
If your concerned with how much money Gas costs, go with the lower octane.
Also, E-85, or "Corn" gas, or ethanol gas of greater than 10% is a Lower Octane Gas.
to prove it; take a drop and put it on a piece of glass. next to a drop of 94 octane gas.
see which evaporates first. the quicker the evaporation, the lower the octane value.
This is the actual test to determine a fuels octane value.
Hope this clears up some misconceptions about Octane Values for Fuel.
And I apologize if I stepped on any toes.